LED Driver. A6280 Datasheet

A6280 Driver. Datasheet pdf. Equivalent

Part A6280
Description 3-Channel Constant-Current LED Driver
Feature A6280 3-Channel Constant-Current LED Driver with Programmable PWM Control Last Time Buy This part is.
Manufacture Allegro MicroSystems
Datasheet
Download A6280 Datasheet



A6280
A6280
3-Channel Constant-Current LED Driver
with Programmable PWM Control
Last Time Buy
This part is in production but has been determined to be
LAST TIME BUY. This classification indicates that the product is
obsolete and notice has been given. Sale of this device is currently
restricted to existing customer applications. The device should not be
purchased for new design applications because of obsolescence in the
near future. Samples are no longer available.
Date of status change:
A6280EA-T September 3, 2013
A6280EESTR-T June 3, 2013
Deadline for receipt of LAST TIME BUY orders: November 29, 2013
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, contact Allegro Sales.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, LLC reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.



A6280
A6280
3-Channel Constant-Current LED Driver
with Programmable PWM Control
Features and Benefits
3 × 10-bit PWM brightness settings
3 × 7-bit dot correction current settings
5 to 17 V operation
Wide output current range, 10 to 150 mA per channel
Serial port/PWM clock operates at up to 5 MHz
Data and clock logic architecture allows single
microcontroller control of large quantities of serially-
connected A6280s at fast data transfer rate
Buffered logic outputs to drive cables
Thermal shutdown and UVLO protection
Power-On Reset
Packages: 16-pin DIP (suffix A), and
16-contact QFN (suffix ES)
ES, approximate scale 1:1
Description
The A6280 is a 3-channel constant current LED driver that
has a wide range of output currents. The A6280 controls LED
brightness with a Pulse Width Modulation (PWM) scheme
that gives the application the capability of displaying a billion
colors in an RGB cluster. The maximum current is set by an
external resistor.
The LED brightness is controlled by performing PWM control
on the outputs. The brightness data of the PWM signal for
each LED is stored in three 10-bit registers. The peak value
for each LED can be adjusted (dot-corrected) to compensate
for mismatch, aging, and temperature effects. All the internal
latched registers are loaded by a 31-bit shift register. One
address bit controls whether dot correction/clock divider ratio
or brightness data is loaded into the registers. The remaining
bits are used for the data. This helps reduce the pin count of
the A6280. To further lower the A6280 pin count, the PWM
clock and the serial bus clock share the same pin and work
concurrently to control LED brightness and to load data.
TheA6280 is designed to minimize the number of components
needed to drive LEDs with large pixel spacing. A large number
of A6280s can be daisy chained together and controlled by
just four control signals (clock, serial data, latch, and output
enable). Each of these inputs has buffered outputs to drive
the next chip in the chain. Also, VIN can be tied to the LED
Continued on the next page…
Application Diagram
Power Supply Bus
Clock
Data
Latch Enable
Output Enable
Microprocessor
Control Board
Cat5 UTP
VLED
VIN OutR OutG OutB
Clock In
Clock Out
Data In
Data Out
Latch In
Latch Out
OE In
OE Out
VREG A6280 REXT
Pixel Board #1
Cat5 UTP
VLED
VIN OutR OutG OutB
Clock In
Clock Out
Data In
Data Out
Latch In
Latch Out
OE In
OE Out
VREG A6280 REXT
Pixel Board #2
Cat5 UTP
Pixel Board #N
Figure 1. Functional drawing of daisy chained display application. Additional pixel boards
with A6280 ICs can be applied.
A6280-DS, Rev. 7





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